In mobile products, the top layer is a protective layer composed of glass with an anti-scratch coating, or PMMA (polymethyl methacrylate), commonly called plexiglas or acrylic. This top layer is often shaped, back-printed with the company logo or decorative graphics and button indicators, and is the outward-most facing material of the touch product. Directly underneath the surface layer is a layer of thin adhesive and then the electrically conductive layers for touch sensing.