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RE: How to retain the same impedance for a cline in both surface and inner layers

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The issue what i am facing right now is I have a 4 layer board and a critical net is set to have impedance of 60 ohm which changes the track width to 6.31mils when routing on surface layer and when the same track is routed to inner layer (layer 2) the width changes to default width of 5 mils which i dont want it to happen. Should i do any changes to cross-section in order to maintain same width even in inner layer ? or are there any alternatives ?

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