LNK305 Layout

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Is it recommended to put GROUND plane under LNK305D in multi layer board.
I have a 4 layer board in which LNK305D is used to generate 1.5W Power.
I intend to keep 2nd layer as GND ? is it OK to do so or i should go ahead with slandered suggested layout in datasheet.
Will the switching of LNK have any affect on GND plane underneath?

Hi abhishekmoghe.1,
If the topology you are using is non-isolated, it's ok to have a wider GND plane but I would suggest to have 1mm distance from high voltages.