Talhah narrates from his grandfather (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) wiped his head, he would begin with his hands from the front of the head until he took them to behind his ears.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 277
(a) Talhah (may Allah have mercy on him) narrates from his grandfather (may Allah be pleased with him) that he saw the Prophet (peace and blessings be upon him) performing ablution; he (peace and blessings be upon him) wiped his head and his ears and passed his hands over his nape.
(b) Layth bin Abi Sulaym (may Allah have mercy on him) said: He wiped his head until he reached the beginning of the nape; but he did not mention passing the hands over the nape.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 278
It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that when he wiped his head, he would also wipe his nape along with his head.
(b) This report is mawquf (stopping at the Companion), and the musnad (attributed to the Prophet) version has weakness in its chain. And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 279