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**1. Homework Statement**

1 [tex](H_1 - H_2) \times \hat n = J_s[/tex]

2 [tex](H_1t - H_2t) = \hat n \times J_s[/tex]

How does one get from the first statement to the second statement?

3 [tex]H_{1t} - H_{2t} = J_s[/tex]

This is causing an interesting problem when I plug in numbers, I would have just left it with statement (3) but if I do I get something completely different. My book gives (2) but doesn't explain how it derives it.