The spelling of the word "gotten beam" may seem confusing to non-native English speakers because of the unusual use of the word "gotten." In fact, "gotten" is an archaic form of "got" that is still used in some dialects of British English and has become less common in American English. The phonetic transcription of this word would be /ˈɡɑtn/ for "gotten" and /biːm/ for "beam." Therefore, the correct spelling for this phrase would be "gotten beam."