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Self-assembly of dense windmill structure. (A) and (B) High-resolution STM images showing clockwise and counterclockwise fashion. Vbias = 624 mV and It = 653 pA for (A), and Vbias = 648 mV and It = 660 pA for (B). (C) and (D) Structural models for adlayers in domain R and S. One dodecyloxy chain in a molecule pointing out from the HOPG surface is omitted in the models.
