If the PathFollower is rotating to match the Path (@see Phaser.GameObjects.Components.PathFollower#rotateToPath) this value is added to the rotation value, in degrees. This allows you to rotate objects to a path but control the angle of the rotation as well.
Should the PathFollower automatically rotate to point in the direction of the Path?
The Path this PathFollower is following. It can only follow one Path at a time.