Improve: Fix the default value of layer.bottom_nodule_radius in 3D Layout App

[linmingchih]

Description of the current limitations

I have identified an issue that requires fixing. Currently, the default value of layer.bottom_nodule_radius is set to 0.5. When layer.user = True, the value 0.5mil or 0.5mm is assigned in the roughness setting of the layer. However, if the user fails to notice this issue, it can lead to a schema error during simulation.

To address this problem, I suggest changing the default value to the string '0.5um', which is consistent with the AEDT GUI default. This adjustment will ensure that users no longer encounter unit mismatch problems in the settings and can smoothly conduct simulations.

Please make sure to update this setting in the modified version to enhance the user experience.

If you have any other questions or need further discussion, feel free to reach out to me.

Thank you for your attention to this matter!

Code sample expected

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Useful links and references

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