涂层

涂层	tú céng	protective layer / coating
涂	tú	to apply (paint etc) / to smear / to daub / to blot out / to scribble / to scrawl / (literary) mud / street
涂	Tú	surname Tu
涂	tú	variant of 途
层	céng	to pile on top of one another / layer; stratum / floor (of a building); story / (math.) sheaf / classifier for layers