If I give the fabricator enough information will he be able to manufacture my board? Well possibly, any material specs you give are only valid if that material is stocked by your fabricator, substitutions are often made and different materials will have different characteristics.
Obviously, the fabricator needs to know which layer goes where in the stackup and the more information given about those layers the better the chance your board will perform to expectations. The finished thickness of the board (after pressing) is most important, check value with the fabricators capability. The positions of cores and prepregs should be given with their thicknesses and any additional useful information such as Dk value and don't forget about the thickness of each of the copper layers.
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