The loop mentioned in the question must look like one as shown in the figure Magnetic field at the centre due to semicircular loop lying in x-y plane ,Bxy=
1
2
µ0i
2R
negative z direction. Similarly, field due to loop in x-z plane,Bxz=
1
2
µ0i
2R
in negative y direction ∴ Magnitude of resultant magnetic field,