Question on STM (scanning tunneling microscopy)

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Joined May 11, 2018
here is the surface of highly oriented pyrolytic graphite (HOPG). to be viewed by an STM

Why do we view only one atom on 2 on this surface and if you dont mind which one is it ? i think the answer is that we only view the upper atoms that are on the surface but i do not know if it is correct


IN this figure below the atomic resolution is the one obtained at the lower part of the image . how can you calculate a scale bar on this image . thanks