When will a defendant be denied a substitution of attorney?

supra, 2 Cal.3d 118, 124.) A trial court may not deny a request for substitution of attorneys without giving the defendant the opportunity to explain his reasons through presentation of argument and evidence. (Ibid.) "All Marsden held was that a defendant is denied a fair trial when the trial court refuses to hear enumerated specific examples of inadequate representation." (People v. Huffman (1977) 71 Cal.App.3d 63, 77.) When the defendant is afforded an opportunity to state the reasons for discharging an appointed attorney, the trial court's decision to allow a substitution of attorney is discretionary unless the defendant has shown that failure to order substitution is likely to result in constitutionally inadequate representation.