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(a) Scheme (left panel) and STM image (right panel) showing the switching behavior of BTB monolayers on HOPG at the solid/liquid interface (>12.5 μM in nonanoic acid) by changing the bias voltage (Vbias = from −850 to +850 mV; I = 150 pA). (b–d) Equilibrium structures obtained by DFT calculations of the (b) oblique, (c) close-packed, and (d) honeycomb structures.
