Figure 2

STM images of the GaN(000) surface displaying (a) 1x1, (b) 3x3, (c) 6x6, and (d) c(6x12) reconstructions. Sample bias voltages are -0.75, -0.1, +1.5, and +1.0 V, respectively. Tunnel currents are in the range 0.03 - 0.11 nA. Gray scale ranges are 0.17, 0.88, 1.33, and 1.11 Å respectively. Unit cells are indicated with edges along <110> directions. (From [30]).

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