An article 1, wherein {HEAD ~ the layer} comprises {TAIL ~ more than about 70% sp3 carbon carbon bonds} 
comprises
An article 1 , wherein { HEAD ~ the layer } comprises { TAIL ~ more than about 70 % sp3 carbon carbon bonds }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL