Apparent superstructures were observed, using scanning tunnelling microscopy, on well-ordered (110) surfaces. It was shown that these superstructures were due to the discrete nature of the sampling of the atomic corrugations by a scanning tunnelling microscope. Such sampling effects were suggested to explain the superstructures that had previously been observed on graphite surfaces by using scanning tunnelling microscopy.

J.T.Li, R.Berndt, W.D.Schneider: Applied Physics Letters, 1995, 67[7], 921-3