@NonNull open fun layer(layer: String!): StaticImage.NotRequiredStep
Overrides NotRequiredStep.layer
The map layer requested. If the layer is not set in the Request the default value is used. See #layerBasic(), or #layerHybrid(), or #layerLabels(). The default value is #LAYER_BASIC.
layer - String!: The requested layer.
Return
StaticImage.NotRequiredStep: builder.