What is this 2oz copper pcb?
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Solved by mariushm,
Thicker copper traces and internal planes to carry voltages around the board. 1oz is around 1.4 mil (35 micrometers) of height, 2z is... more, duh.
More copper reduces the voltage drop over long distances, due to the resistance of traces.
The extra copper can also help to spread the heat, basically make the internal copper layers and copper fills behave like heat spreaders / heat sinks, helping with the vrm cooling on the motherboard.
It can also help in some cases in combination with circuit boards that use a different type of fiber weaving, to reduce water ingress, in countries with high humidity... thinner traces will corrode faster.
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