The layer of {HEAD ~ gating agent} is disposed atop one of the substrate and the principal substance on the substrate, and the gating agent and the principal substance are applied to {TAIL ~ the same side} of the substrate 
The layer of { HEAD ~ gating agent } is disposed atop one of the substrate and the principal substance on the substrate , and the gating agent and the principal substance are applied to { TAIL ~ the same side } of the substrate
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH