Origin of the metal-insulator transition in ultrathin films of La2/3Sr1/3MnO3RemoveZhaoliang Liao, Fengmiao Li, Peng Gao, Lin Li, Jiandong Guo, Xiaoqing Pan, R. Jin, E. W. Plummer, and Jiandi ZhangPhys. Rev. B 92, 125123 (2015)