Looking for documentation on layer names.

Can anybody point me to where I find the documentation on what the required layers and their names are for each of the elements? Also I have been looking at some example files and noticed some differences. For instance in a psd puppet file a mouth layer is named Aa but in a different Illustrator file there is a moth layer named Ah instead of Aa. Does illustrator and photoshop have different requirements for CA? I'm looking to make an Illustrator character that has head turns. Is this possible in Illustrator as well as Photoshop? Any documentation would be greatly appreciated. Thanks!