The spelling of the word "re fine" can be explained by breaking down its phonetic transcription using the International Phonetic Alphabet (IPA). The first syllable "re" is pronounced with the consonant sound "ɹ" followed by the vowel sound "i" as in "e" in "be." The second syllable "fine" is pronounced with the consonant sound "f" followed by the vowel sound "aɪ" as in "i" in "kite" and the consonant sound "n." Therefore, the proper spelling for this word is "refine."