A coating substrate containing an aluminum or aluminum rolled alloy product for thin-film coatings for producing electronic components. The coating substrate prevents the interdiffusion of substrate elements and thin-film coating elements and enables the thin-film coatings to grow completely over irregularities. The local irregularities on the substrate surface to be coated, which have a maximum extension, measured vertically to the substrate surface, of less than 10 um and than 0.1 um, are such that the flanks of the local irregularities can be exposed to material deposition impinging on the substrate surface in a perpendicular manner.