a) a welded wire face mat having an upright portion of an extended height for {HEAD ~ disposition} over {TAIL ~ a portion} of the face of the formation 
a ) a welded wire face mat having an upright portion of an extended height for { HEAD ~ disposition } over { TAIL ~ a portion } of the face of the formation
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 OTH OTH OTH OTH OTH OTH