The perforations can them be used to adhere {HEAD ~ internal features} to {TAIL ~ the multi layer substrate} 
to
The perforations can them be used to adhere { HEAD ~ internal features } to { TAIL ~ the multi layer substrate }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL