Fig. 1
From: Observation of Anomalous Resistance Behavior in Bilayer Graphene
a Comparison of Raman spectra at 532 nm for mono- to bilayer graphene. The position of G peak and the spectral features of 2D band confirm the number of atomic layer of the graphene. The 2D band (inset shows the close-up plot) of bilayer graphene is red-shifted and broadened with respect to that of the monolayer graphene. b Four-terminal resistance R xx as a function of carrier density n