Contribution to the Conductivity of Bc 3

Recently the new graphitic material, BC 3, has been shown to exhibit electrical conductance which is 10% larger than graphite. In order to explain this behavior we show that in the BC 3 monolayer the Fermi level lies at the top of the o bands and that the semimetallic behavior, which appears upon stacking of the semiconducting monolayers, arises from the simultaneous presence of o and ~ bands at the Fermi level.