wherein the intermediate layer is in the form of a continuous layer comprising at least one recess, {HEAD ~ the at least one recess} forming {TAIL ~ the at least one absorption region} 
forming
wherein the intermediate layer is in the form of a continuous layer comprising at least one recess , { HEAD ~ the at least one recess } forming { TAIL ~ the at least one absorption region }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL