#layer.flat_solid  single thickness of usually some homogeneous substance
  supertype:  #flat_solid__sheet  a flat artifact that is thin relative to its length and width
  part of:  #laminate
  subtype:  #backing.layer__mount  something forming a back that is added for strengthening
  subtype:  #blanket  a layer of lead surrounding the highly reactive core of a nuclear reactor
  subtype:  #course.layer__row  a layer of masonry; "a course of bricks"
     subtype:  #row_of_bricks  a course of bricks place next to each other (usually in a straight line)
  subtype:  #interlayer  a layer placed between other layers
  subtype:  #ply  (usually in combination) one of several layers of cloth or paper or wood as in plywood
  subtype:  #tier  one of two or more layers one atop another: "tier upon tier of huge casks"; "a three-tier wedding cake"
  subtype:  #wall.layer  a layer of material that encloses space; "the walls of the cylinder were perforated"; "the container's walls were blue"

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