Use this to limit the depth to 2:
Get-ChildItem ***,**,*
The way it works is that it returns the children at each depth 2,1 and 0.
Explanation:
This command
Get-ChildItem ***
returns all items with a depth of two subfolders. Adding * adds an additional subfolder to search in.
In line with the OP question, to limit a recursive search using get-childitem you are required to specify all the depths that can be searched.
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