If we compare a Raman spectrum of monolayer graphene and bilayer or fewlayer graphene, we will see that the 2D peak intensity decreases (relative to the G peak intensity) for the later cases. I have not clear what is the reason. I suppose it could be related to the density of states for the phonons near the K point. Or maybe the what is actually happens is that the intensity of the G peak increases with the number of layers. And this could be related to the splitting of the electron dispersion for bi/few layer graphene. Could you please clarify my ideas? I would appreciate your contributions.

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