def METHOD_NAME(self) -> None:
    super().METHOD_NAME()
    # find layer's physical id
    layer_name = NestedStackBuilder.get_layer_name(self._deploy_context.stack_name, self._function_identifier)
    layer_versions = self._lambda_client.list_layer_versions(LayerName=layer_name).get("LayerVersions", [])
    if not layer_versions:
        raise NoLayerVersionsFoundError(layer_name)
    self._layer_arn = layer_versions[0].get("LayerVersionArn").rsplit(":", 1)[0]