  We observe strongly dissimilar scattering from two types of edges in
hexagonal quasi-monocrystalline gold flakes with thicknesses around 1 micron.
We identify as the origin the interference between a direct, quasi-specular
scattering and an indirect scattering process involving an intermediate
surface-plasmon state. The dissimilarity between the two types of edges is a
direct consequence of the three-fold symmetry around the [111]-axis and the
intrinsic chirality of a face-centered cubic lattice. We propose that this
effect can be used to estimate flake thickness, crystal morphology, and surface
contamination.
