Patent ID: 8420207

Claim:
A substrate provided with a thin film multilayer comprising an alternation of n functional layers having reflection properties in the infrared and/or in solar radiation and (n+1) coatings, where n is an integer ≧2, said coatings being composed of a plurality of dielectric layers, so that each functional layer is placed between two coatings, at least two functional layers each being deposited on a wetting layer itself deposited respectively directly onto a subjacent coating, wherein two subjacent coatings each comprise at least one dielectric layer and at least one dielectric noncrystalline smoothing layer made from a material that is different from the material of said dielectric layer within each coating, said smoothing layer being in contact with said superjacent wetting layer and in that these two subjacent coatings being of different thicknesses, the smoothing layer of the thicker of the two subjacent coatings is at least as thick as the smoothing layer of the other subjacent coating, wherein all of the smoothing layers are an oxide layer or a mixed oxide layer based on an oxide of one or more of the following metals: Sn, Si, Ti, Zr, Hf, Zn, Ga, and In, wherein each wetting layer subjacent to a functional layer is based on zinc oxide, and wherein each dielectric layer adjacent to a smoothing layer within said subjacent coatings is based on silicon nitride and/or aluminum nitride.