An apparatus 1, wherein said panel core of each panel has a predetermined length and width, and said at least one screening layer of each panel includes {HEAD ~ a plurality} of {TAIL ~ screening layers} comprising: 
of
An apparatus 1 , wherein said panel core of each panel has a predetermined length and width , and said at least one screening layer of each panel includes { HEAD ~ a plurality } of { TAIL ~ screening layers } comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH