For given spectral densities `S`

and `SC`

compute the Kronecker product
`S %x% SC`

at each frequency.

1 | ```
freqdom.kronecker(S, SC)
``` |

`S` |
first spectral density |

`SC` |
second spectral density |

Frequency Domain Operator object

1 2 3 4 5 6 | ```
n = 100
X = rar(n,d=3)
Y = rar(n,d=3)
SX = spectral.density(X)
SY = spectral.density(Y)
R = freqdom.kronecker(SY,SX)
``` |

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