To provide an exposure method and an exposure apparatus, using a complementary divided mask, designed to enable alignment of a complementary divided mask at a high precision over the entire region of a semiconductor wafer. The differential GMR head includes two self-pinned GMR sensors separated by a gap layer. If the next best cell fails to admit all the mandatory RABs and if there are no other intra-LTE or inter-LTE cells available for HO, the source eNB may perform an inter-Radio Access Technology, RAT, HO using the Single Radio Voice Call Continuity, SRVCC, procedure.