Not sure what you ment with the layer thing.
I'm still learning my way through HTML5 (I have had some experience with the markups that proceeded it though), so I just wanted to be clear on the issue :)
re "div layers", that was a foobar on my part. I meant "div tags". Sorry for the confusion.
But that isn't semantically correct. A div tag is just a div tag - like all other div tags.
An article tag is "a div tag", unlike all other div tags. It tells that this is the main part of the webpage.