Extended Data Fig. 2: Stacking of α-Fe2O3 (orange motifs) on SnO2 (blue motifs) at the sub-unit cell level.

Motifs of α-Fe2O3 (001) dimensionally match but chemically mismatch with those of SnO2 (101). While motifs of α-Fe2O3 (104) chemically match but dimensionally mismatch with those of SnO2 (101). Both dimensional and chemical matching are achieved between motifs of α-Fe2O3 (110) and SnO2 (101). Atomic arrangements of these models are shown in Supplementary Figs. 7–9.