  By tilting the samples in the magnetic field, we measured and compared the
Skyrmion excitations in the bilayer quantum Hall (QH) state at the Landau-level
filling factor $\nu =2$ and in the monolayer QH state at $\nu =1$. The observed
number of flipped spins is $N_s=14$ in the bilayer system with a large
tunneling gap, and $N_s=7$ in the bilayer system with a small tunneling gap,
while it is $N_s=7$ in the monolayer system. The difference is interpreted due
to the interlayer exchange interaction. Moreover, we have observed seemingly
preferred numbers $N_s=14,7,1$ for the flipped spins by tilting bilayer
samples.
