Computational Discovery of Ultralow Thermal Conductivity in the Energy-Degenerate Polymorphic Crystal Family A 2 M 2 M ’ Q 4 - Zhi Li; Yukun Liu; Michael A. Viti; Shima Shahabfar; Dale Gaines; Yi Xia; Mercouri G. Kanatzidis; Christopher Wolverton (Journal of the American Chemical Society, 2026)