The lecture Cells of the Epidermis by Geoffrey Meyer, PhD is from the course Epithelial Tissue.
this article handles the explanation for skin layers; which I find as the hardest of the topics, in a well organised and logically acceptable building. It is really interesting to read. It summarizes the topic but without the loss of any crucial information. Also, the use of well-labelled pictures and microscopic slides is a plus and catalyse the understanding. I would recommend this to my premedical colleagues.