1 Supporting Information Thickness-insensitive properties of α-MoO3 nanosheets by weak interlayer coupling Jong Hun Kim 1,# , Changbae Hyun 2,# , Hangyel Kim 1,# , Jatis Kumar Dash 3 , Kyuwook Lhm 4 , a nd Gwan-Hyoung Lee 1,5,* 1 Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Korea 2 Department of Physics, Pohang University of Science and Technology, 37673, Pohang, Korea 3 Department of Physics, SRM University-AP, Amaravati, Andhra Pradesh, 522502, India 4 Department of Physics and Pohang Accelerator Laboratory, Pohang University of Science and Technology, 37673, Pohang, Korea 5 Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 08826, Korea # These authors contributed equally. *Corresponding authors: gwanlee@snu.ac.kr