When I need 2mm paper I just glue 4 x 0,5mm (in my case 300gsm paper) together. Depending on the piece I either cut the pieces out first and then glue or glue the full paper and then cut once dried. To make sure the paper dries flat without warping I put it between two large cardboard pieces I have for this purpose and then put a couple of heavy books on it and leave the glue to set for quite a while (preferable overnight).
The reason I like to go this route is that I rarely have 2mm cardboard around and also that it dulls sharp blades so fast.
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