Abdullah bin Abbas (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) prayed during the solar eclipse in the same way that Urwah narrated from Aishah (may Allah be pleased with her): he (peace and blessings be upon him) performed two bowings in every rak'ah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخسوف / 6304