Fig. 3: The energy barriers and schematic diagrams for different sliding paths of AB’A’ and AB’C’ stacking configurations.
From: Cluster sliding ferroelectricity in trilayer Quasi-Hexagonal C60

a Energy barriers and b schematic diagrams if different polarization-switching paths of the AB’A’ configuration. c Energy barriers and d schematic diagrams of different polarization-switching path of the AB’C’ configuration.