Wiktionary
surface quality
n. a numerical description of the flatness or roughness of a surface, especially an optical or machined surface
Usage examples of "surface quality".
Sophistication could be a surface quality, a flair for dress and a collection of worldly mannerisms.
The Texan looked about at the quiet faces, his gaze at once abstract and alert, with an impenetrable surface quality like flint, as though the surface were impervious or perhaps there was nothing behind it.