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High-resolution STM images (15 nm × 15 nm) of molecule PAI1 (a), PAI2 (b), PAI6 (c), and PAI8 (d) at the 1-phenyloctane/HOPG interfaces. The unit cells are inserted on the STM images. Tunneling parameters: (a) 298.8 pA, 511.2 mV; (b) 299.1 pA, 567.3 mV; (c) 299.1 pA, 601.5 mV; and (d) 299.1 pA, 623.8 mV.
