{HEAD ~ Each side} may also have {TAIL ~ a height} between about 5 μm and about 15 μm 
have
{ HEAD ~ Each side } may also have { TAIL ~ a height } between about 5 μm and about 15 μm
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH