Estimates for the Fourier coefficients of the Duke-Imamoglu-Ikeda lift

Let $k$ and $n$ be positive even integers. For a Hecke eigenform $h$ in the Kohnen plus subspace of weight $k-n\mathrm{/}2+1\mathrm{/}2$ for ${\Gamma }_0(4)$, let $I_n(h)$ be the Duke-Imamoglu-Ikeda lift of $h$ to the space of cusp forms of weight $k$ for $S{p}_n(\mathbb{Z})$. We then give an estimate of the Fourier coefficients of $I_n(h)$. It is better than the usual Hecke bound for the Fourier coefficients of a Siegel cusp form.