Will assets in Resources subfolders be duplicated in the bundle?

I notice that some of the assets in our project are in subfolders called Resources (for example /Assets/Textures/foo/Resources). Do these subfolders get treated in the same way as the /Assets/Resources folder and get bundled (like nested Editor and Plugin folders are treated the same way as /Assets/Editor and /Assets/Pllugins). If they do, will they get duplicated in the package if also referenced by objects in a scene.

So to give an example:
I have a scene /Assets/TestScene.unity, and it has in it an object Foo with the material /Assets/TestScene/Resources/Foo.mat, which has the texture /Assets/TestScene/Resources/Foo.png.

Will Foo.mat and Foo.png be bundled both in the Application.dataPath/Resources and in Application.dataPath/TestScene/Resources?

Yes - any folder called Resources is compiled along with the other Resources folders into the build - however, I believe only one thing with each name will appear in the build - so you can’t have 2 foo.png files in the same place.