A 2D electron gas of graphene on hBN gives rise to FOs from steps with a period of 15 Å. The theoretical description is similar to the one proposed by the Friedel approach, with the exception of a much faster decay as compared to noble metals due to absence of electron backscattering in the graphene(for more theoretical insight please refer to section 3.10 of this review). On the other hand, at bias voltage of -20 mV graphene on Cu(100) substrate as studied by Mallet et al. has produced period similar to noble metals of 2.2 nm. Both of these studies point to the importance of substrate on the electronic properties of the studied surface.