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Physical Review Letters – 19 December 2003
Volume 91, Issue 25

The figure is an atomically resolved STM image of the topmost oxygen layer in a Al2O3 film on a NaAl substrate. The unit cell is illustrated in the upper right corner; atoms with the largest apparent height are indicated by the filled-in gray circles. The zigzag pattern seen in the image is thought to result from every second oxygen atom sticking out a bit from the surface. [M. Kulawik, N. Nilius, H.-P. Rust, and H.-J. Freund, Phys. Rev. Lett. 91, 256101 (2003)]

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