The invention relates to a cemented carbide or ceramic article having a multilayered coating of a plurality of ultrathin CVD coating layers, and a process for producing same. The reflector comprises a glass substrate, an intermediate layer, consisting essentially of aluminum oxide, disposed on the substrate, a reflective silver layer disposed on the intermediate layer, and a passivation layer disposed on the silver layer. A first flow path having a relatively small gas flow capacity may serve as a pilot to control the gas flow through a second flow path having a larger gas flow capacity.