Plotting plane waves and their fft2 plots

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Evolution
Evolution il 15 Mar 2015
Commentato: James Evans il 29 Giu 2022
I have been trying to plot a 2d plane wave like the one given below using surf and ezsurf but no luck .Similarly the fft2 plot is different .I am interested in knowing which commands to use to reproduce such figures and fft plot?

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