For custom layers only, use this parameter to specify the layer's short name, which is used internally by AWS OpsWorksand by Chef. The short name is also used as the name for the directory where your app files are installed. It can have a maximum of 200 characters and must be in the following format: /\A[a-z0-9\-\_\.]+\Z/.
The built-in layers' short names are defined by AWS OpsWorks. For more information, see the Layer Reference (http://docs.aws.amazon.com/opsworks/latest/userguide/layers.html)