If your electronics design requires specific impedance properties, for example a differential impedance of 90 ohms, & you need to design the PCB which can meet this criteria, then you'll need to research & calculate the best trace-width, trace-space, layer-to-layer spacing, as well as which PCB materials should be used. Keep in mind that there are certain tolerances encountered at each stage during PCB fabrication: the trace etching tolerances, the material thickness tolerances, as well as the copper finish tolerances.
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