By unbounded is meant that the adhesive clusters do not include any applied linear boundary or perimeter of {HEAD ~ adhesive} defining {TAIL ~ the cluster area} 
defining
By unbounded is meant that the adhesive clusters do not include any applied linear boundary or perimeter of { HEAD ~ adhesive } defining { TAIL ~ the cluster area }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL