"I'd go with /'&t@,mit@r/ ("AT-uh-mee-tur"), except with a tap for the /t/ sounds, which would make it, in ASCII IPA, /'&*@,mi*@r/ ("AD-uh-mee-dur" is the closest that pronunciation spelling can come to representing that tap),"
The flap (*) is not phonemic. It's a phonetic reflex of both /t/ and /d/, but it's perceived as one or the other, as evidenced by the minimal pair "writer" and "rider", both of which have (*) for (most of) those who have it at all. (The distinction is made based on the length of the preceding vowel, longer before /d/.)
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