Tirmidhi

Hadith Commentary: Benefits and Issues: This hadith establishes that the follower (muqtadi) should not recite the Qur’an aloud behind the imam, because doing so causes difficulty for the imam in his own recitation. In some silent prayers (salahs), such as Dhuhr and ‘Asr, the Companions would sometimes recite a surah aloud after al-Fatihah behind the Prophet (sallallahu alayhi wa sallam), which is why he (sallallahu alayhi wa sallam) objected to recitation after al-Fatihah and instructed them to recite quietly.

From this, it is understood that in silent prayers, after al-Fatihah, any surah should also be recited quietly. In audible prayers (rak‘ahs), there is no recitation (by the follower) besides al-Fatihah, unless the follower is at such a distance from the imam that the imam’s recitation does not reach him; in that case, he may recite after al-Fatihah as well, but this recitation should be done quietly.