  Edges naturally exist in a single-layer graphene sample. Similarly,
individual graphene layers in a multilayer graphene sample contribute their own
edges. We study the Raman spectrum at the edge of a graphene layer laid on n
layer graphene (nLG). We found that the D band observed from the edge of the
top graphene layer exhibits an identical line shape to that of disordered
(n+1)LG induced by ion-implantation. Based on the spectral features of the D
and 2D bands, we identified two types of alignment configurations at the edges
of mechanically-exfoliated bilayer and trilayer graphenes, whose edges are
well-aligned from their optical images.
