"Translucent layers" refers to thin, see-through materials or surfaces that allow light to pass through but are not completely transparent. Full definition
While some of the banners are opaque, most are in translucent layers that allow solid grounds to shine through. (brooklynrail.org)
Each canvas is divided in half, consisting of two contrasting colors — with each color arrived at through numerous translucent layers. (stevenalexanderjournal.blogspot.ru)
There were four lights mounted on each side of the bezel and the e-reader used a different translucent layer that adds both the touch screen and side light functions. (goodereader.com)