A coin that is clad and is a Missing Clad Layer would only be missing one side. So it is not missing Clad Layer. What it could be is a Improperly Annealed Planchet which is a totally different Mint Error.
Just wanted to say that I'm not totally sure your Dime is Improperly Annealed Could also be just Natural toning and/or Environmental Damage
Yes for sure I know. You would tell me right away if you were sure of it. Thanks now I know something else to look for.