what particle goes between a na adj and an I-adj?

[FinancialWar]

意外な高いです
意外の高いです
意外と高いです
意外に高いです

I am confused.

 

[Mike Cash]

In that example と

 

[FinancialWar]

hi mike: is there a rule this or depends on individual circumstances.

 

[Toritoribe]

意外に高いです is also correct. に is usually used for adverbial usage of na-adjectives, i.e, not only when with i-adjectives but also when with na-adjectives or verbs. と is basically for -tari conjugation type adjectives （タリ活用形容動詞） like 平然, 悠然, 厳然, 堂々, 粛々,,,. 意外と is an exception.

 

[Mike Cash]

It is important, though, not to think of it in terms of "what goes between a -na adjective and an -i adjective" because there will be times when it is simply an "and" sort of situation and "de" (-te form of -na) is used.

静かで美しい for example.