What is the ruling on placing the right hand on the front of the head and reciting supplications and Qur'an, as some worshippers do?

Placing the hand on the forehead while reciting or supplicating has not been reported from the Prophet, peace and blessings be upon him, and adopting a specific posture in worship without a legal basis is considered an innovation (bid'ah). However, if it is for the purpose of ruqyah (Islamic exorcism/healing), then there is no harm in it, such as a Muslim placing his hand on a painful area and supplicating with the reported prayers, or reciting the Mu'awwidhat (Surahs Al-Falaq and An-Nas) and wiping his body with them before sleep.