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Step and terrace structure has been observed in an area of 1μm×1μm on the cleaved surface of KCl–KBr solid-solution single crystal by scanning near-field optical microscope (SNOM) with a small sphere probe of 500nm diameter. Lateral spatial resolution of the SNOM system was estimated to be 20nm from the observation of step width and the scanning-step interval. Vertical spatial resolution was estimated...