Ok you need a punnett square? its gonna be easy, create the square first, Then put the letters in their, When done message me
Given that,
The electric field is given by,

Suppose, B is the amplitude of magnetic field vector.
We need to find the complete expression for the magnetic field vector of the wave
Using formula of magnetic field
Direction of
vector is the direction of propagation of the wave .
Direction of magnetic field = 

We need to calculate the poynting vector
Using formula of poynting

Put the value into the formula


Hence, The poynting vector is 
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