This option in our website is the parameter for top/bottom circuit layers. For inner layer, the copper weight is 0.5oz.
More copper weight will make your board have better electrical properties but it will also increase the difficulty to etch the board.
If you want your board can be batch produced, please make sure the min track/spacing meet the following specification.
|Copper weight||The Min Track/Spacing for online quotation|
|Copper weight||The Min Track/Spacing for offline quotation|