layer

Change active layer

Signature

layer <top|up|N|down|bottom>

Absolute Layer Navigation

layer top
layer <N>
layer bottom

Switch the active layer to a specific layer, top and bottom go to the top and bottom copper layers respectively, and the 0-based number <N> will go to that copper layer specifically (with 0 being equivalent to top).

Relative Layer Navigation

layer up
layer down

Switch the active layer one step either up (towards top) or down (towards bottom).

See the layer table for additonal ways to manage layers.