A chemical crosslinking step can be preferred when {HEAD ~ the polyelectrolyte multilayer} is formed on a substrate that is unstable at {TAIL ~ temperatures} required for crosslinking  
A chemical crosslinking step can be preferred when { HEAD ~ the polyelectrolyte multilayer } is formed on a substrate that is unstable at { TAIL ~ temperatures } required for crosslinking
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH