Yes, if you give all the impedance detail, we will help you to decide the best possible stack up. And if you have already given the stack up detail, we will verify the stack up detail against impedance requirement and also we will make sure that you will get the required impedance in the finished PCBs.
If we get the impedance details, we are not only verifying the calculations again but we are generating an additional coupon for your boards and process those coupons along with your boards on a same production panel and after the production is finished, we separate those coupons from the panel and measure the impedance requirement on that coupon with the polar instrument and also if required we are doing destructive testing also. And if we are not getting the satisfactory results on the coupons, we will scrape the whole lot and we relaunch your job without any additional charges and do the required changes needed in the production and will deliver the PCBs once we get the satisfactory results on the coupons.
All this is possible only if you give the complete impedance details otherwise we will produce the PCBs as requested by you with the chosen stack up only and we will not take care for the other parameters.