In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

Guether, have you investigated why 4 layer exhibits better EMI properties than 2 layer? Is it because flood fills frequently used for power and ground planes on 2 layer boards create resonant cavities for EMI to be amplified, or the board material dampens EMI because the power planes are internal? Not important, just curious.

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