Enhancing Magnon–Magnon Coupling Strength to 0.6 GHz in Dion–Jacobson Cu(II)-Hybrid Perovskites by Tuning the Topology of Ligands - Weixin He; Luwen Jiang; Yali Yang; Walter P. D. Wong; Yunzhe Ke; Shiyue Sun; Shuaishuai Ding; Wenping Hu; Ramanathan Mahendiran; Kian Ping Loh (Journal of the American Chemical Society, 2025)