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Ultra low impedance route

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fala

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Hello board, it seems that nobody has answered my previous post so let me put a new question for my problem but in much simpler way. I want to establish a very low impedance path between two different boards( the track length in total is about 20Cm. I measured DC resistance of tracks on my boards and I found surprisingly it is quite high about 5mOhm/Cm for 50 mil tracks( I tried to consider probe resistance for better accuracy) and an edge connector connection gave me about (20-50mOhm) deponding on edge connector type resistance! even solid planes had about 500uOhm/Cm resistance. I want total 300uOhm resistance for a track of 20Cm. Is there any solution?
Thanks a lot.
 

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