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