The spelling of the word "martz" can be quite confusing as it is not a commonly used term. According to IPA phonetic transcription, the word "martz" is spelled as "/mɑːrts/". This means that the word has two syllables, with the stress on the first syllable. The "ar" sound is pronounced as "ɑː" and the "tz" sound is pronounced as "ts". Overall, the word "martz" is spelled in a way that accurately represents its pronunciation.