Schedule 0 [LEDIAp-11] Inductively Coupled Plasma Reactive Ion Etching of GaN Films Maintaining Surface Flatness for Surface Activated Bonding *Naoki Yokoyama1, Ryo Tanabe1, Takaya Morikawa1, Yasufumi Fujiwara1, Masahiro Uemukai1, Tomoyuki Tanikawa1, Ryuji Katayama1 (1. Osaka University)