Bismillahi Al-Rahmani Al-Rahim

Reciting Al-Fatihah behind the imam

Is it wajib for the follower to recite the fatiha behind the Imam?

Reciting Al-Fatiha, saying "allahu akbar" when moving from position to position, saying the tasbih at least once when bowing and prostrating, and saying "allahumma ighfir li" between prostrations all personally obligatory for the imam and people praying alone.

When praying behind an imam, his performance of them suffices for those praying behind. But it is still recommended to recite Al-Fatiha during the four places where the imam is supposed to pause.

And Allah knows best.

wa al-salamu `alaykum