Plane Stress - 3D Problem

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Hi,
I want to simulate a 3D case. However, for simplicity, I approximated the problem to a plane stress case.
I used this example, https://fenicsproject.org/pub/tutorial/html/._ftut1008.html, to implement the 2D case. I considered only a 2D case, the z components are all null. However, in a state of stress, the strain zz is not null. In this way, the results obtained are different from those obtained in commercial software.

I think the difference lies in not having given the thickness of the mesh element.

How do you implement a plane 2D stress case and provide the mesh thickness?
Is it possible to solve this kind of problems in Fenics?
Thanks

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@bleyerj’s tutorial here shows how to convert a plane strain code to plane stress through a modification of the material parameters.

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