The Au(111) surface is more stable than the (100) or the (110) surface (lower surface energy), which is true for most of the fcc metals.
However, depending on the experimental conditions or on how the surface is cleaved and so on, you can expect the (100) or the (110) surface, vicinal surfaces, reconstructed surfaces, ...
You can find references about Au(100) electrodes for example.
Of course in VNL you can chose the hkl indices by using the surface cleave plugin in the Builder and build whatever electrode you wish!
