code: @Api
  	public Layer<?> getLayer(String layerId) {
  		if (layers != null) {
  			for (Layer<?> layer : layers) {
  				if (layer.getId().equals(layerId)) {
  					return layer;
  				}
  			}
  		}
  		return null;
  	}
docs: Search a layer by it's id.
  
  @param layerId
  The layer's client ID.
  @return Returns either a Layer, or null.
  @since 1.6.0