windows - Add folder name to beginning of filename

I have a directory structure as below:

Folder
  > SubFolder1
    > FileName1.abc
    > Filename2.abc
    > .............
  > SubFolder2
    > FileName11.abc
    > Filename12.abc
    > ..............
  > ..........

etc. I want to rename the files inside the subfolders as:

SubFolder1_Filename1.abc
SubFolder1_Filename2.abc
SubFolder2_Filename11.abc
SubFolder2_Filename12.abc

i.e. add the folder name at the beginning of the file name with the delimiter "_". The directory structure should remain unchanged. Note: Beginning of file name is same. e.g. in above case File*.

I made below Script

---

for /r "PATH" %%G in (.) do (
  pushd %%G
  for %%* in (.) do  set MyDir=%%~n*
  FOR %%v IN (File*.*) DO REN %%v  "%MyDir%_%%v"
  popd
  )

---

Problem with the above script is that it is taking only one Subfolder name and placing it to the beginning of file name irrespective of the folder.