
betreffend
relevant
As an adjective or participle with the meaning 'the respective' or 'the one in question'.
Bitte leiten Sie die E-Mail an den betreffenden Mitarbeiter weiter.
Please forward the email to the relevant employee.
concerning / relevant
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relevant
As an adjective or participle with the meaning 'the respective' or 'the one in question'.
Bitte leiten Sie die E-Mail an den betreffenden Mitarbeiter weiter.
Please forward the email to the relevant employee.

concerning
As a postposed preposition with the meaning 'regarding' or 'as far as ... is concerned'.
Ihre Anfrage betreffend, werden wir uns in den nächsten Tagen bei Ihnen melden.
Concerning your inquiry, we will get back to you in the next few days.
'Betreffend' is the present participle of the verb 'betreffen' (to concern, to affect). It therefore literally means 'concerning' or 'referring to'.
Alle Dokumente, die diesen Fall betreffen, müssen gesammelt werden.
All documents that concern this case must be collected.
The function of 'betreffend' depends on its position. If it comes before a noun, it is an adjective and is declined. If it comes after a noun, it is a preposition.
Der betreffende Sachbearbeiter ist heute nicht im Haus.
The relevant case worker is not in the office today.
The use as a postposed preposition ('Ihren Antrag betreffend' — concerning your application) is typical of formal written language, especially in administration or business.
Die neuen Regelungen betreffend, gibt es noch einige Unklarheiten.
Concerning the new regulations, there are still some uncertainties.
When the phrase with 'betreffend' stands at the beginning of the sentence, the conjugated verb follows directly afterward (inversion). The noun before 'betreffend' is in the accusative.
Den von Ihnen genannten Vorfall betreffend, haben wir eine Untersuchung eingeleitet.
Concerning the incident you mentioned, we have initiated an investigation.
respective
Jeweilig usually establishes a correspondence between several cases and their respective documents. Betreffend refers to the specific document or case currently being discussed. Jeweilig fits a distribution among several items; betreffend fits the individual item in question.

Die Mitarbeiterin legt das Formular in die betreffende Akte.
The employee puts the form in the file in question.
Die Mitarbeiter legen jedes Formular in die jeweilige Akte.
The employees put each form in the respective file.