Fig. 2. (a) Lateral and (b) top view of the PAW/PBE-D3 optimized structure of (PEA)₂SnI₄. (c) Still top view of the optimized structure of PEA₂SnI₄ with the highlighted inorganic motif of the two, top (orange, Sn; green, I) and bottom (mauve, Sn; purple, I), layers. (d) PAW/PBE-D3 + SOC calculated bandstructure for the (PEA)₂SnI₄ bilayer and (e) for the monolayer. For the sake of comparison (f) the PAW/PBE-D3 calculated bandstructure for the (PEA)₂PbI₄ monolayer is similarly reported. [mauve (and orange in (c)): Sn; purple (and green in (c)): I; brown: C; cyan: N; white: H atoms].