The probability of landing on heads each time a fair coin is flipped, is 1/2.

Assuming that the question was supposed to be:

"What is the probability of landing on heads twice in a row?"

To calculate compound probabilities like this, we first have to work out the probability of landing on heads each time, and then multiply these two probabilities to get a compound probability.

1/2 x 1/2 = 1/4

So the probability of landing on heads twice in a row = 1/4 (for a fair coin)