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.
大気の上層にはオゾン層がある。
The ozone layer is in the upper layer of the atmosphere.
彼は社会の上層階級に属している。
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