Reflection symmetry enhances four-phonon scattering in monolayer transition-metal semiconductors with large acoustic-optical gapsRemoveYuan Yao, Hao Chen, Wen-Wen Liu, Chang-Hao Ding, Xiong Wu, Yu-Jia Zeng, Nannan Luo, Jiang Zeng, Li-Ming Tang, and Ke-Qiu ChenPhys. Rev. B 113, 155416 (2026)