upper layer; upper stratum; upper level
Refers to a higher physical layer, social class, or organizational level. Common in contexts like geology, atmosphere, society, and building stories.
The ozone layer is in the upper layer of the atmosphere.
He belongs to the upper class of society.
In the upper atmosphere, the temperature is low.
His family occupied the upper stratum of society.
top brass; upper echelon; higher-ups; top management
upper floor; upper storey