  Surface resistivity of hydrogenated amorphous carbon films was measured as a
function of the applied electrical field. The measured dependence shows a sharp
ambipolar peak near zero gate voltage. Furthermore, we found that in some
samples sheet resistance at the peak is as low as 7.5 k{\Omega}/sq. This value
is the same order of magnitude as the sheet resistance of a defect free
graphene monolayer. Therefore a conclusion is made that an intrinsic graphene
with dimensions of at least millimeters exist on the surface of amorphous
carbon films. These results can open new perspectives not only for graphene
applications, but also for better understanding of this unique material.
