{HEAD ~ The surface layer} is formed of {TAIL ~ metal crystals} belonging to a cubic system with a plane of by Miller indices directed so as to form the slide surface 
{ HEAD ~ The surface layer } is formed of { TAIL ~ metal crystals } belonging to a cubic system with a plane of by Miller indices directed so as to form the slide surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH