What term is defined as layering water caused by temperature?

Stratification is defined as the layering of water caused by temperature. I guess you are talking about condensation. Condensation is the transition of gas to liquid, the opposite of boiling.

Sometimes it happens that there is a layer of water on objects caused by temperature. This happens when warmer air which contains water in gas from makes contact to a much cooler surface like a cold window or mirror, causing the water to condensate back to liquid form.

This same principle causes dew in the morning.