This dialog lets you choose both the name and controller type of the new layer.
Lists all available layers in your scene. You can use the default name, enter a custom name, or pick one from the list. If you choose an existing layer from the list, it inherits that layer's name and weight properties. Refer to Working with Animation Layers for more details.
Determines the controller type to assign to each track within the animation layer.
For example, if a track in the active layer has a Noise controller, adding a new layer copies that controller type.