The spelling of "Mattinson" is a combination of various phonemes. /m/ represents the sound of "m", /æ/ is pronounced as "a" in "cat", /t/ represents "t" sound, /ɪ/ denotes "i" in "sit", /n/ is pronounced as "n" and /s/ represents the sound of "s". The phonetic transcription of "Mattinson" can be written as /mætɪnsən/ which represents the exact pronunciation of the word. It is important to use correct phonetic transcription to understand the accurate pronunciation of words.