Fusion PCB Specification -- Provide separation dimensions between layers.
For computing strip-line impedance it is important to know the distance between conducting layers and the dielectric constant of the insulator material. If averages are provided please also provide variance
21
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Anton S. commented
This is board stackup. Please vote here http://support.seeedstudio.com/forums/243707-my-seeed-idea/suggestions/9357699-stackup-information-pcbs