In one embodiment, {HEAD ~ an inner layer} of the multi layer substrate can be provided with {TAIL ~ perforations} 
In one embodiment , { HEAD ~ an inner layer } of the multi layer substrate can be provided with { TAIL ~ perforations }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL