C23C 28/046

Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups [CPC: C23C2/00] - [CPC: C23C26/00] or by combinations of methods provided for in subclasses [CPC: C23C] and [CPC: C25C] or [CPC: C25D] only coatings of inorganic non-metallic material {with at least one amorphous inorganic material layer, e.g. DLC, a-C:H, a-C:Me, the layer being doped or not}