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