#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
  subtype:  #backing.layer  #blanket  #course.layer  #interlayer  #ply  #tier  #wall.layer
  part of:  #laminate  sheet of material made by bonding two or more sheets or layers

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