@User: "xhigh" poly resistance is nominally 2 kohms/square according to SkyWater documentation, so a 0.5 / 0.35 = 1.43 squares resistor should be about 2857 ohms + change (for the terminal resistance, which should be around 120 ohms for each terminal). So it seems like both tools are wrong. I'm now looking into why magic's value is so far off. It has the right sheet rho, so I don't know what it's doing.