layer

a layer of soot on the windowsill; two layers of paint.

There can be multiple layers of metaphor in a single poem.

alternating layers of basalt and sandstone.

a carpet layer;

a bricklayer.

You can layer this vest over a blouse or sweater.

My hairdresser insisted on layering my hair at my last visit—I rather like it this way.

Frilly blouses don't layer well.