Sh. Ibn ‘Ashur On What Is Better After Prayers
The Question: After the obligatory prayer, is it better to perform voluntary prayers or to recite Al-Fatiha?
The Answer: Performing voluntary prayers after the obligatory ones, except for Asr and Fajr, is better than reciting Al-Fatiha; because performing voluntary prayers after the obligatory prayers, other than those two, is Sunnah, and it includes reciting Al-Fatiha along with additional prayers.
As for after Fajr, it is recommended to engage in remembrance, glorification, supplication, and reading the Quran, including Al-Fatiha, until sunrise.
As for after Asr, the ruling on recitation and supplication for those not occupied with seeking knowledge or the like is the same as their ruling at other times.
It is not appropriate to adhere to reciting Al-Fatiha immediately after the congregational prayer because people may think that this act is among the sunnahs of the prayer.
Muhammad Al-Tahir Ibn Ashur
Tunisian Fatwas: 1/500