A micro-magneto-Raman scattering study of graphene on a bulk graphite   substrate
  We report on a magneto-Raman scattering study of graphene flakes located on the surface of a bulk graphite substrate. By spatially mapping the Raman scattering response of the surface of bulk graphite with an applied magnetic field, we pinpoint specific locations which show the electronic excitation spectrum of graphene. We present the characteristic Raman scattering signatures of these specific locations. We show that such flakes can be superimposed with another flake and still exhibit a graphene-like excitation spectrum.   Two different excitation laser energies (514.5 and 720 nm) are used to investigate the excitation wavelength dependence of the electronic Raman scattering signal. 
C. Faugeras, J. Binder, A. A. L. Nicolet, P. Leszczynski, P. Kossacki,   A. Wysmolek, M. Orlita, M. Potemski
cond-mat.mes-hall