Luxembourg’s Grand Duke Henri officially appoints his son Guillaume as his deputy on Tuesday, paving the way for the transfer of office of head of state. As “lieutenant-représentant,” Hereditary Grand Duke Guillaume, 42, will take on “certain responsibilities” while Grand Duke Henri, 69, will remain the head of state, according to the state ministry and the grand ducal palace. When Henri will abdicate is still undecided. After the signing of the grand ducal appointment decree at the palace, Guillaume is due to be sworn in before the Chamber of Deputies. Following the ceremony, the grand duke a…