{HEAD ~ Various other photoinduced reactions} may be used in {TAIL ~ the third technique} to bond the FLC molecules to the alignment layer 
{ HEAD ~ Various other photoinduced reactions } may be used in { TAIL ~ the third technique } to bond the FLC molecules to the alignment layer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH