The cuticle of a leaf is located on the outermost surface of the leaf, specifically on the upper epidermis.

Here's a breakdown:

* Epidermis: The outer layer of cells that covers the leaf. There are two main types: the upper epidermis and the lower epidermis.

* Cuticle: A waxy, waterproof layer that sits on top of the upper epidermis.

Think of the cuticle as a protective "skin" for the leaf, preventing excessive water loss and protecting it from damage.