This is the A style half sheet. Alice, like lots of other films of the day, would often have several different poster styles, sometimes in all formats. Alice only had multiple styles of half sheet - A and B.
Half-sheets are 22x28, approximately half the size of a one-sheet (natch), and is of a heavier paper stock, almost card stock, similar to the paper stock used for lobby cards. The art is the same as on the six-sheet from yesterday, although the six-sheet has correct colors whereas this one does not, something that we will see later as well. This is also the same art used on the cover of the herald from this post.