Note:
Previously, descriptions such as @G02684@ layers, carbon layers or carbon sheets have been used for the term graphene. Because @G02684@ designates that modification of the @C01022@ carbon, in which planar sheets of carbon atoms, each atom bound to three neighbours in a honeycomb-like structure, are stacked in a three-dimensional regular order, it is not correct to use for a single layer a term which includes the term @G02684@, which would imply a three-dimensional structure. The term graphene should be used only when the reactions, structural relations or other properties of individual layers are discussed.