Tuning surface plasmon-exciton coupling via thickness controlling of excitonic layer Chunfeng Cai, Boxuan Zhang, Xiaoyu Wang, Li Ling, Tianning Xu, Tianhao Huang, He Zhu, Gang Bi and Huizhen Wu EPL, 135 5 (2021) 57001 Published online: 08 November 2021 DOI: 10.1209/0295-5075/ac2454