Supplement Number 1

See the supplementary material for the phonon spectra of monolayer MA2Z4 and M2A2Z4 (Figs. S1-S11); the ternary convex hulls of representative monolayer materials (Fig. S12); the Brillouin zone paths of monolayer 2H-MA2Z4, 1T-MA2Z4, and α-M2A2Z4 phases (Fig. S13); the band structures of the above-mentioned monolayer MA2Z4 and M2A2Z4 systems (Figs. S14-S22); and the average atomic masses of monolayer MA2Z4 and M2A2Z4 (Table S1).

请参阅补充材料，其中包含单层MA₂Z₄与M₂A₂Z₄的声子谱（图S1~S11）、典型单层材料的三元凸包（图S12）、单层2H-MA₂Z₄、1T-MA₂Z₄及α-M₂A₂Z₄相的布里渊区（Brillouin zone）路径（图S13）、前述单层MA₂Z₄与M₂A₂Z₄体系的能带结构（图S14~S22），以及单层MA₂Z₄与M₂A₂Z₄的平均原子质量（附表S1）。