superstrate

Noun

 * 1) A layer or stratum adjacent and parallel to another.
 * 2)  The sudden increase in the electrical conductivity of some metals as their temperature falls to near absolute zero.
 * 3)  The covering on the sunny side of a photovoltaic (PV) module, providing protection for the PV materials from impact and environmental degradation while allowing maximum transmission of the appropriate wavelengths of the solar spectrum.

Verb

 * 1) To arrange in parallel layers or strata.