Adding Contour Lines to a 2D Surf Plot

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Hello everyone,

I am working on plotting the stress distribution over a nonprismatic beam in MATLAB. The figure generated by my code is shared below (fig1). However, I am struggling to add contour lines to my plot, similar to what is shown in the second figure (fig2). I haven't been successful in achieving this, and I would appreciate any guidance on how to accomplish it.

Thank you in advance!

figure1

Figure2

My code is as below.

Here A is 1x3201 matrix while B and C are 40x3201 matrix

figure(13)
surf(A,B,C)
view(2)
shading interp
colormap(jet(1000))
xlabel('{\it x} (mm)'), ylabel('{\it y} (mm)')
hold on
grid off
c=colorbar('Location','southoutside')
axis([0 L -hmax/2 hmax/2])
axis off
c.Ticks = [linspace(min(C,[],'all'),max(C,[],'all'),7)];
Deci=arrayfun(@(x) sprintf('%.4f',x),c.Ticks,'un',0);
set(c,'xticklabel',Deci)