Abstract In a previous STM investigation by Yang and co-workers a variety of 2D ordered atomic-scale features of glycine molecules adsorbed on graphite were observed and several models have been proposed to interpret these features. In the present work, atomic charge superposition(ACS) calculations of STM images of their models were carried out. The calculated images match the experimental ones fairly well, indicating the general validity of the ACS method to the glycine/graphite system and the correctness of their interpretations. The reason of the validity, the origin of the atomic resolution, and the proper tip-sample distance are also discussed.
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