From Sahih Muslim (Hadith 2094):
A'isha reported that the Messenger of Allah (ﷺ) recited loudly in the eclipse prayer, and he observed four rak'ahs in the form of two rak'ahs and four prostrations. Zuhri said:Kathir b. 'Abbas narrated on the authority of Ibn 'Abbas that the Messenger of Allah (ﷺ) observed four rak'ahs and four prostrations in two rak'ahs
Reference: Muslim 2094