{HEAD ~ Other methods} for crosslinking {TAIL ~ polymer chains} of the polyelectrolyte multilayer are known 
for crosslinking
{ HEAD ~ Other methods } for crosslinking { TAIL ~ polymer chains } of the polyelectrolyte multilayer are known
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH