Why sometimes the GND plane on top layer is a grid not a fill area?

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neutrino

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Dear sirs,

why sometimes in a double layer PCB, the GND plane on top layer is grid and not a fill area?? What is the improvement? I think that fill ground plane is better than grid plane for EMI and EMC. Where i can find articles or documentation about GND tipology?

Thanks and Regards
 

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