{HEAD ~ A lock} in step can prevent {TAIL ~ further changes} in the structure of the porous multilayer 
{ HEAD ~ A lock } in step can prevent { TAIL ~ further changes } in the structure of the porous multilayer
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH