Does the Imam say the takbir and rise to complete the recitation after the prostration of recitation, or does he perform the prostration of the rak'ah thereafter?

It is prescribed for the worshipper, if he recites a verse of prostration during prayer, to prostrate. He should say "Allahu Akbar" when prostrating and when rising from it, then stand. He has the choice: if he wishes, he may complete the recitation then bow, or if he wishes, he may bow immediately.