Probing ultraweak in-plane magnetic anisotropy within a two-dimensional layered antiferromagnet - Yijie Fan; Yihong Xu; Renji Bian; Ruan Zhang; Junning Mei; Jiaxin Wu; Binghe Xie; Shuangxing Zhu; Yu Chen; Feifan Gu; Ying Liu; Takashi Taniguchi; et al. (Proceedings of the National Academy of Sciences, 2025)