Of course. As long as it is a pure wax (meaning that it has no cleaner) it can be layered. If you are good in putting on the wax, and thoroughly buffing it off, you can layer as many coats as you want. Just be mindful that in time, your paint should be re-cleaned and re-layered with wax. Don't keep piling it on for years without deep cleaning and re-applying, or else you will notice dullness and dirt beneath your shine.
To me, there is nothing that can match the resolution a well applied and deep layered high quality carnauba waxed paint surface.
You will find also that your waxed surface will last a lot longer with multiple coats; I would say as a rule of thumb, between 5-9 coats. You will not need that many to get the minimum amount of protection, but in terms of depth of shine and resolution, I have found that with a high quality carnauba wax, the coatings should be between 5 and 9 coats, with 9 and up being the place you want to be at in terms of depth of shine.
PS: Try not to cake on too many layers of wax in a single session (ie five coats of wax on a saturday, etc. One and/or up to two coats per session is enough). The best shine and longest lasting result has to be slowly applied, stretched, cured and re-applied.
